| Method and apparatus for improving performance of erasure sequence detection -> Monitor Keywords |
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Method and apparatus for improving performance of erasure sequence detectionMethod and apparatus for improving performance of erasure sequence detection description/claimsThe Patent Description & Claims data below is from USPTO Patent Application 20090161606, Method and apparatus for improving performance of erasure sequence detection. Brief Patent Description - Full Patent Description - Patent Application Claims
Wireless communication systems are widely deployed to provide various types of communications such as voice, data, video, etc. These systems may be multiple-access systems capable of supporting communication with multiple access terminals by sharing available system resources (e.g., bandwidth, transmit power etc.) Examples of such multiple-access systems include code division multiple access (CDMA) systems, time division multiple access (TDMA) systems, frequency division multiple access (FDMA) systems, orthogonal frequency division multiple access (OFDMA) systems or combinations thereof. Typically, a wireless communication system comprises several base stations, wherein each base station communicates with a mobile station using a forward link and each mobile station (or access terminal) communicates with base station(s) using a reverse link. When data is generated for transmission by a user, a service request is transmitted via established communication channels from a user equipment/access terminal to a serving base station and based on negotiated service options/availability, resources are assigned to the user. Most modern wireless communication systems have a mix of users carrying different types of traffic flows. This necessitates different mechanisms to assign the physical channel resources (bandwidth, time etc.) to different users. Typically, in a synchronous system with centralized scheduling, the receiver\'s data is broken into packets which are coded independently, and the receiver\'s channel assignment lasts at least for the duration of the packet. This duration itself may be fixed or may vary depending on feedback from the receiver. But after this duration, one approach is to keep the assignment until it is explicitly terminated or reassigned to another user—such assignments are called ‘sticky’. Another approach is to say that each assignment lasts only for the packet duration—such assignments are called ‘non-sticky’. Therefore, for users who need an assigned communication resource for longer periods of time, sticky assignments make it unnecessary to keep reassigning the resource to them. This potentially reduces their latency as well as reducing the signaling overhead on the control channel that carries the user assignments. Further, it allows the system to support a situation where there are a large number of users, each needing a small bandwidth for a long time period (e.g. voice users), without overloading this control channel. However, it makes it necessary to include in the control channel signaling, ways to inform the owner of termination of a sticky assignment, e.g., either by a reassigning the resource to another user (in which case, the control signal must be heard by both the current and the new user) or by an explicit deassignment message to the current user. Additionally, in order to maintain the usefulness of sticky assignments for the above-mentioned situation with a large number of voice users, it is necessary to allow users to hold sticky assignments even when there is no data to send them. This necessitates a mechanism to let each user know at any given time whether their sticky assignment is carrying data or not. Accordingly, a transmitter sends a known sequence, called an ‘erasure sequence’, which the receiver will attempt to detect to decide whether or not a frame corresponds to the start of a packet or to an erasure. However, the erasure sequences have to be detected within a short time period e.g., one frame. Additionally, the erasure detection process cannot obtain gains from H-ARQ (Hybrid Automatic Repeat Request) procedure while coding across multiple frame durations. This makes erasure detection harder than normal packet demodulation. The following presents a simplified summary of the claimed subject matter in order to provide a basic understanding of some aspects of the claimed subject matter. This summary is not an extensive overview of the claimed subject matter. It is intended to neither identify key or critical elements of the claimed subject matter nor delineate the scope of the claimed subject matter. Its sole purpose is to present some concepts of the claimed subject matter in a simplified form as a prelude to the more detailed description that is presented later. In accordance with an aspect, a method for transmission that facilitates erasure detection within communication systems is disclosed. The method comprises, receiving one or more communications from an access terminal, and estimating one or more attributes associated with the access terminal from at least the received communications. The duration for erasure sequences is assigned based at least on the estimated attributes. In accordance with further aspects, resources can be assigned to the access terminal, which assignment is conveyed to the terminal via a resource assignment message. The duration of erasure sequence is communicated to the access terminal in the resource assignment message. In accordance with various aspects, the assignment can be a sticky assignment for the access terminal. Another aspect relates to the duration being conveyed to the access terminal within a group assignment message when the terminal is part of a group of access terminals. In accordance with different aspects, the one or more attributes conveyed can pertain to one or more of bandwidth assignment size, the terminal\'s received signal strength, or the terminal\'s traffic model. Accordingly, the one or more estimated attributes can be associated with bandwidth size assigned to users/access terminals. Therefore, if the terminal is assigned higher bandwidth, a shorter erasure duration is determined while a longer erasure duration is conveyed if the terminal is associated with lower bandwidth. In another aspect the attributes can be associated with the terminal\'s received signal strength and the terminal is assigned longer erasure duration if its signal strength is low, while a shorter erasure duration is assigned if it has higher signal strength. In accordance with another aspect, the one or more attributes are associated with a terminal\'s traffic model. Accordingly, if the terminal is associated with a traffic model with more frequent occurrences of longer erasures, it is assigned a longer erasure duration and if the traffic model has infrequent occurrences of longer erasures, it is assigned a shorter erasure duration. In accordance with yet another aspect, a terminal\'s burst statistics are monitored by computing a histogram that shows the probabilities of occurrences of bursts of consecutive erasures of different lengths and computing a mean burst length. The mean burst length is employed in determining the erasure duration to be assigned in a manner that does not change the average value of the terminal\'s latency. In accordance with a further aspect, the access terminal implements MIMO (multiple input multiple output) or SIMO (single input multiple output) schemes for communications such that different QoS flows are assigned different erasure sequence durations. Another aspect relates to monitoring the access terminal for variations in attributes and reassigning erasure sequence durations if the one or more attributes vary beyond a predetermined range. Another aspect is associated with a system for improving erasure sequence detection. The system comprises a communications component that facilitates information exchange with the access terminals, an estimation component that estimates one or more attributes associated with the access terminals via the communications received from the access terminals; and an assigning component that assigns erasure durations to each of the one or more access terminals based on their respective attributes. In accordance with another aspect, a processor readable media comprising instructions operable to facilitate erasure detection is disclosed. The instructions facilitate receiving one or more communications from an access terminal, estimating one or more attributes associated with the access terminal and assigning erasure duration based on the estimated attributes. Another aspect is associated with a system for improving erasure sequence detection. The system comprises a means for communication that facilitates communications with one or more access terminals. The system also comprises a means for processing that estimates one or more attributes associated with the access terminals via the communications received from the access terminals and assigns erasure durations to each of the one or more access terminals based on their respective attributes. In accordance with another aspect, a method of communication that facilitates erasure detection is disclosed. The method comprises transmitting one or more attributes associated with access terminals, receiving duration for erasure sequences, the duration is determined based on the transmitted one or more attributes, and transmitting data packets alternated with erasure sequences of the received durations. The erasure sequence duration is received in a message conveying information regarding resource assignments to an associated access terminal. In accordance with different aspects, the assignment is a sticky assignment or a group assignment. The method relates to further varying erasure sequence durations based on variations in the one or more attributes. In another aspect, the access terminal can implement one of MIMO or SIMO systems of communication such that data streams with different attributes transmit data packets with erasure sequences of different durations based on respective attributes. In another aspect, a system for improving erasure sequence detection is disclosed. The system comprises one or more communication component and a processing component associated with an access terminal. The communication components are operable to transmit/receive information. In particular they transmit one or more attributes associated with the access terminal. The processing component receives duration for erasure sequences from an access point, wherein the duration for erasure sequences is determined based on the one or more attributes. In accordance with yet another aspect, a processor readable medium storing instructions that facilitate erasure detection is disclosed. The instructions are operable for transmitting one or more attributes, receiving duration for erasure sequences, and transmitting data packets alternated with erasure sequences of the received durations. The duration is determined based at least on the transmitted one or more attributes. Another aspect is associated with a system for improving erasure sequence detection. The system comprises one or more means for communication associated with an access terminal. The means for communication are operable to transmit/receive information. In particular, the communication means transmit one or more attributes associated with the access terminal and receives determined erasure sequence durations. The duration for erasure sequences is determined based at least on the transmitted one or more attributes. The system also comprises a means for processing that generates erasure sequences based on the received duration. The following description and the annexed drawings set forth in detail certain illustrative aspects of the claimed subject matter. These aspects are indicative, however, of but a few of the various ways in which the principles of the claimed subject matter may be employed and the claimed subject matter is intended to include all such aspects and their equivalents. Other advantages and distinguishing features of the claimed subject matter will become apparent from the following detailed description of the claimed subject matter when considered in conjunction with the drawings. Continue reading about Method and apparatus for improving performance of erasure sequence detection... 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Techniques are described herein for the transmission and use of various types of signaling, such as Access Request commands, Reverse Link Special Resource Utilization Message (R-SRUM) signaling, Forward Link Special Resource Utilization ... ###  How KEYWORD MONITOR works... a FREE service from FreshPatents1. Sign up (takes 30 seconds). 2. Fill in the keywords to be monitored. 3. Each week you receive an email with patent applications related to your keywords. Start now! - Receive info on patent apps like Method and apparatus for improving performance of erasure sequence detection or other areas of interest. ### Previous Patent Application: Frame structure for an adaptive modulation wireless communication system Next Patent Application: Method and arrangement in a telecommunication system Industry Class: Multiplex communications ### FreshPatents.com Support Thank you for viewing the Method and apparatus for improving performance of erasure sequence detection patent info. 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